[net] Remove logic for fixing up Gzip encoding type for downloads.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 35c3c071a86a9d8d52a18c6df008a67fe2997faa..05943b2feda8863d8fc60b88bd01e34884e1c229 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -8895,9 +8895,8 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 <histogram name="Extensions.FeatureProviderStaticInitTime" units="milliseconds">
   <owner>rkaplow@chromium.org</owner>
   <summary>
-    The amount of time that elapsed during
-    extensions::FeatureProvider::Static. Only measured while in the browser
-    process.
+    The amount of time that elapsed during extensions::FeatureProvider::Static.
+    Only measured while in the browser process.
   </summary>
 </histogram>
 
@@ -17791,6 +17790,10 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="Net.GzipEncodingFixupResult" enum="GzipEncodingFixupResult">
+  <obsolete>
+    Removed around 2015/03/18. The code which implemented Gzip encoding fixup
+    was removed.
+  </obsolete>
   <owner>asanka@chromium.org</owner>
   <summary>
     Resources are sometimes transferred with an incorrect encoding type of gzip.
@@ -19607,8 +19610,8 @@ Therefore, the affected-histogram name has to have at least one dot in it.
     enum="QuicSessionLocations">
   <owner>rch@chromium.org</owner>
   <summary>
-    The location in quic_client_session.cc where a session is unexpectedly
-    not going away.
+    The location in quic_client_session.cc where a session is unexpectedly not
+    going away.
   </summary>
 </histogram>